<template>
  <div v-if="!component && showLoader" class="card overflow-hidden">
    <div class="loader">Loading...</div>
  </div>
  <div v-else class="card">
    <div v-if="sections.length" class="card-header d-flex bg-white justify-content-between">
      <ul class="nav nav-pills">
        <li class="nav-item" @click.prevent="sectionSelected = sections[0].name">
          <a href="#" :class="['nav-link', sectionSelected === sections[0].name && 'active']">
            {{ title ? title : sections[0].label }}
          </a>
        </li>
      </ul>
      <ul class="nav nav-pills justify-content-end">
        <template v-for="(section, i) in sections">
          <li v-if="i !== 0" :key="section.name" class="nav-item">
            <a
              href="#"
              :class="['nav-link', section.name === sectionSelected && 'active']"
              @click.prevent="sectionSelected = section.name"
            >
              <slot :name="section.name + '-label'">
                <svg
                  v-if="section.name === 'template' && showIcons"
                  xmlns="http://www.w3.org/2000/svg"
                  width="20"
                  height="20"
                  viewBox="0 0 24 24"
                  stroke-width="2"
                  fill="none"
                  stroke-linecap="round"
                  stroke-linejoin="round"
                >
                  <path stroke="none" d="M0 0h24v24H0z" fill="none" />
                  <polyline points="7 8 3 12 7 16" />
                  <polyline points="17 8 21 12 17 16" />
                  <line x1="14" y1="4" x2="10" y2="20" />
                </svg>
                <svg
                  v-if="section.name === 'script' && showIcons"
                  xmlns="http://www.w3.org/2000/svg"
                  width="20"
                  height="20"
                  viewBox="0 0 24 24"
                  stroke-width="1.5"
                  fill="none"
                  stroke-linecap="round"
                  stroke-linejoin="round"
                >
                  <path stroke="none" d="M0 0h24v24H0z" fill="none" />
                  <path d="M14 3v4a1 1 0 0 0 1 1h4" />
                  <path d="M17 21h-10a2 2 0 0 1 -2 -2v-14a2 2 0 0 1 2 -2h7l5 5v11a2 2 0 0 1 -2 2z" />
                  <line x1="9" y1="9" x2="10" y2="9" />
                  <line x1="9" y1="13" x2="15" y2="13" />
                  <line x1="9" y1="17" x2="15" y2="17" />
                </svg>
                <svg
                  v-if="section.name === 'style' && showIcons"
                  xmlns="http://www.w3.org/2000/svg"
                  width="20"
                  height="20"
                  viewBox="0 0 24 24"
                  stroke-width="2"
                  fill="none"
                  stroke-linecap="round"
                  stroke-linejoin="round"
                >
                  <path stroke="none" d="M0 0h24v24H0z" fill="none" />
                  <path d="M14 3v4a1 1 0 0 0 1 1h4" />
                  <path d="M17 21h-10a2 2 0 0 1 -2 -2v-14a2 2 0 0 1 2 -2h7l5 5v11a2 2 0 0 1 -2 2z" />
                  <path d="M10 13l-1 2l1 2" />
                  <path d="M14 13l1 2l-1 2" />
                </svg>
                <template v-if="showLabels">
                  {{ section.label }}
                </template>
              </slot>
            </a>
          </li>
        </template>
        <li class="d-flex align-items-center">
          <a href="#" class="ml-2 mr-n2 expand-collapse" @click.prevent="expanded = !expanded">
            <svg
              xmlns="http://www.w3.org/2000/svg"
              width="32"
              height="32"
              viewBox="0 0 24 24"
              stroke-width="1.5"
              stroke="#000000"
              fill="none"
              stroke-linecap="round"
              stroke-linejoin="round"
            >
              <path stroke="none" d="M0 0h24v24H0z" fill="none" />
              <path d="M9 10l3 -3l3 3" />
              <path d="M9 14l3 3l3 -3" />
            </svg>
          </a>
        </li>
      </ul>
    </div>
    <div v-show="expanded" class="card-body">
      <template v-for="section in sections">
        <div v-if="sectionSelected === section.name && section.name !== 'example'" :key="section.name">
          <slot :name="section.name"></slot>
          <vue-example-highlight :code="section.contents" :language="section.language" />
        </div>
      </template>
      <template v-if="sectionSelected === 'example'">
        <slot></slot>
        <component :is="component" v-if="component" v-bind="{ ...$attrs, ...$props }" v-on="$listeners" />
      </template>
    </div>
  </div>
</template>

<script>
// SVG icons from // https://tablericons.com/
import VueExampleHighlight from './VueExampleHighlight'
import { loadComponent, loadComponentAsString } from '@dynamic/loadComponent'

export default {
  name: 'SourceView',
  components: {
    VueExampleHighlight
  },
  props: {
    file: {
      type: String,
      required: true
    },
    title: {
      type: String,
      default: null
    },
    stripComments: {
      type: Boolean,
      default: true
    },
    showLabels: {
      type: Boolean,
      default: true
    },
    showIcons: {
      type: Boolean,
      default: true
    },
    showLoader: {
      type: Boolean,
      default: false
    },
    startExpanded: {
      type: Boolean,
      default: true
    }
  },
  data() {
    return {
      component: undefined,
      sections: [],
      sectionSelected: 'example',
      expanded: true
    }
  },
  created() {
    this.createComponent()
    this.createSections()
    this.expanded = this.startExpanded
  },
  methods: {
    createComponent() {
      loadComponent(this.$props.file).then((component) => {
        this.component = component
      })
    },
    createSections() {
      loadComponentAsString(this.$props.file).then((contents) => {
        const sections = []

        sections.push({ name: 'example', label: 'Example', contents: 'N/A', language: 'N/A' })
        sections.push({
          name: 'template',
          label: 'Template',
          contents: this.parseSfcSection('template', contents),
          language: 'markup'
        })
        sections.push({
          name: 'script',
          label: 'Script',
          contents: this.parseSfcSection('script', contents),
          language: 'javascript'
        })
        sections.push({ name: 'style', label: 'Style', contents: this.parseSfcSection('style', contents), language: 'css' })
        this.sections = sections.filter((s) => s.contents)
      })
    },
    parseSfcSection(tag, contents) {
      const string = `(<${tag}(.*)?>[\\w\\W]*<\\/${tag}>)`
      const regex = new RegExp(string, 'g')
      const parsed = regex.exec(contents) || []
      const str = parsed[1] || ''

      return this.stripComments ? this.removeComments(tag, str) : str
    },
    removeComments(tag, str) {
      if (tag === 'template') {
        str = str.replace(/(<!--.*?-->)|(<!--[\S\s]+?-->)|(<!--[\S\s]*?$)/g, '')
        // Remove all extra line breaks
        str = str.replace(/^\s*[\r\n]/gm, '')
      }
      if (tag === 'script') {
        str = str.replace(/(\/\*([\s\S]*?)\*\/)|(\/\/(.*)$)/gm, '')
        // Remove more than one line breaks
        const EOL = str.match(/\r\n/gm) ? '\r\n' : '\n'
        const regExp = new RegExp('(' + EOL + '){3,}', 'gm')

        str = str.replace(regExp, EOL + EOL)
      }
      if (tag === 'style') {
        str = str.replace(/(\/\*([\s\S]*?)\*\/)|(\/\/(.*)$)/gm, '')
        // Remove all extra line breaks
        str = str.replace(/^\s*[\r\n]/gm, '')
      }

      return str
    }
  }
}
</script>

<style scoped>

.card {
  --black-color: #00000030;
  --primary-color: #3eaf7c;
  --white-color: #fff;
  --secondary-color: #717d89;
  position: relative;
  display: -ms-flexbox;
  display: flex;
  flex-direction: column;
  min-width: 0;
  word-wrap: break-word;
  background-color: var(--white-color);
  background-clip: border-box;
  border: 1px solid var(--black-color);
  border-radius: 0.25rem;
}
.card-header {
  padding: 0.75rem 1.25rem;
  margin-bottom: 0;
  background-color: var(--black-color);
  border-bottom: 1px solid var(--black-color);
}
.card-body {
  flex: 1 1 auto;
  min-height: 1px;
  padding: 1.25rem;
}
.d-flex {
  display: -ms-flexbox !important;
  display: flex !important;
}
.bg-white {
  background-color: var(--white-color) !important;
}
.nav {
  display: -ms-flexbox;
  display: flex;
  flex-wrap: wrap;
  padding-left: 0;
  margin-bottom: 0;
  list-style: none;
}
.nav-link {
  display: block;
  padding: 0.5rem 1rem;
}
.nav-link:hover,
.nav-link:focus {
  text-decoration: none;
}
.nav-pills .nav-link {
  border-radius: 0.25rem;
}
.nav-pills .nav-link.active,
.nav-pills .show > .nav-link {
  color: var(--white-color);
  background-color: var(--primary-color);
}
.justify-content-between {
  justify-content: space-between !important;
}
.nav-link:hover,
.nav-link:focus {
  text-decoration: none;
}
.justify-content-end {
  justify-content: flex-end !important;
}
.overflow-hidden {
  overflow: hidden;
}

ul {
  margin-top: 0;
}
.nav-pills .nav-item > a.nav-link:hover {
  text-decoration: none;
  border-bottom: none;
}
.nav-item a svg {
  stroke: var(--primary-color);
  margin-top: -2px;
  vertical-align: middle;
}
.nav-item a.active svg {
  stroke: var(--white-color);
}
.loader {
  font-size: 10px;
  margin: 50px auto;
  text-indent: -9999em;
  width: 6em;
  height: 6em;
  border-radius: 50%;
  background: var(--primary-color);
  background: linear-gradient(to right, var(--primary-color) 10%, var(--white-color) 40%);
  position: relative;
  animation: load 1s infinite linear;
  transform: translateZ(0);
}
.loader:before {
  width: 50%;
  height: 50%;
  background: var(--primary-color);
  border-radius: 100% 0 0 0;
  position: absolute;
  top: 0;
  left: 0;
  content: '';
}
.loader:after {
  background: var(--white-color);
  width: 75%;
  height: 75%;
  border-radius: 50%;
  content: '';
  margin: auto;
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
}
.expand-collapse{
  display: flex;
  align-items: center;
}
.expand-collapse svg {
  stroke: var(--secondary-color);
}
.expand-collapse:hover svg {
  stroke: var(--secondary-color);
}
@keyframes load {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}
</style>
